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POSTFIX, DOVECOT AND SQUIRREMAIL CONFIGURATION..

1- Configure Postfix Server

POSTFIX SERVER [MAIL SERVER] Remote or central computer that holds electronic mail (e-mail) messages
for clients on a network. When the user requests his or her e-mail they
contact the mail server, which delivers to the client computer all mail being stored.Package- Postfix
Port no - 25 [smtp]
Script- /etc/init.d/postfix
Daemon- Postfix
Config file- /etc/postfix/main.cf

# yum install postfix* -y # vim /etc/postfix/main.cf
myhostname = server-1.ashu.com [uncomment this line and add it line no 75]
mydomain = example.com [uncomment it add this line 83]
myorigin = $mydomain [uncomment it line no 99]
inet_interfaces = all [uncomment it line no 113]
#inet_interfaces = localhost [comment it line no 116]
$mydomain [add this end of line no 164]
mynetworks = 192.168.0.0/24, 127.0.0.0/8 [uncomment it and add network add l-264